void AudioFileWriter::run() {
QFile file(outFileName);
bool waveMode = false;
if (outFileName.endsWith(".wav")) waveMode = true;
if (!file.open(QIODevice::WriteOnly)) {
qDebug() << "AudioFileWriter: Can't open file for writing:" << outFileName;
synth->close();
if (!realtimeMode) {
Master::getInstance()->setAudioFileWriterSynth(NULL);
}
return;
}
if (waveMode) file.seek(44);
MasterClockNanos startNanos = MasterClock::getClockNanos();
MasterClockNanos firstSampleNanos = 0;
MasterClockNanos midiTick = 0;
MasterClockNanos midiNanos = 0;
QMidiEventList midiEvents;
int midiEventIx = 0;
uint parserIx = 0;
bool skipSilence = false;
if (realtimeMode) {
firstSampleNanos = startNanos;
} else {
midiEvents = parsers[parserIx].getMIDIEvents();
midiTick = parsers[parserIx].getMidiTick();
skipSilence = true;
}
qDebug() << "AudioFileWriter: Rendering started";
while (!stopProcessing) {
uint frameCount = 0;
if (realtimeMode) {
frameCount = uint((sampleRate * (MasterClock::getClockNanos() - firstSampleNanos)) / MasterClock::NANOS_PER_SECOND);
if (frameCount < bufferSize) {
usleep(ulong((MasterClock::MICROS_PER_SECOND * (bufferSize - frameCount)) / sampleRate));
continue;
} else {
frameCount = bufferSize;
}
} else {
while (midiEventIx < midiEvents.count()) {
const QMidiEvent &e = midiEvents.at(midiEventIx);
bool eventPushed = true;
MasterClockNanos nextEventNanos = midiNanos + e.getTimestamp() * midiTick;
quint32 nextEventFrames = quint32(((double)sampleRate * nextEventNanos) / MasterClock::NANOS_PER_SECOND);
frameCount = uint((sampleRate * (nextEventNanos - firstSampleNanos)) / MasterClock::NANOS_PER_SECOND);
if (bufferSize < frameCount) {
frameCount = bufferSize;
break;
}
switch (e.getType()) {
case SHORT_MESSAGE:
eventPushed = synth->playMIDIShortMessage(e.getShortMessage(), nextEventFrames);
break;
case SYSEX:
eventPushed = synth->playMIDISysex(e.getSysexData(), e.getSysexLen(), nextEventFrames);
break;
case SET_TEMPO:
midiTick = parsers[parserIx].getMidiTick(e.getShortMessage());
break;
default:
break;
}
if (!eventPushed) {
qDebug() << "AudioFileWriter: MIDI buffer overflow, midiNanos:" << midiNanos;
break;
}
midiNanos = nextEventNanos;
midiEventIx++;
emit midiEventProcessed(midiEventIx, midiEvents.count());
}
if (midiEvents.count() <= midiEventIx) {
if (parserIx < parsersCount - 1) {
++parserIx;
midiEventIx = 0;
midiEvents = parsers[parserIx].getMIDIEvents();
midiTick = parsers[parserIx].getMidiTick();
continue;
}
if (!synth->isActive() && frameCount == 0) break;
frameCount += bufferSize;
qDebug() << "AudioFileWriter: Rendering after the end of MIDI file, time:" << (double)midiNanos / MasterClock::NANOS_PER_SECOND;
}
}
while (frameCount > 0) {
uint framesToRender = qMin(bufferSize, frameCount);
synth->render(buffer, framesToRender);
// libmt32emu produces samples in native byte order
QSynth::convertSamplesFromNativeEndian(buffer, framesToRender << 1, waveMode ? QSysInfo::LittleEndian : QSysInfo::BigEndian);
qint64 bytesToWrite = framesToRender * FRAME_SIZE;
char *bufferPos = (char *)buffer;
if (skipSilence) {
qint32 *startPos = (qint32 *)buffer;
qint32 *endPos = startPos + framesToRender;
bytesToWrite = 0;
for (qint32 *p = startPos; p < endPos; p++) {
if (*p != 0) {
skipSilence = false;
bufferPos = (char *)p;
bytesToWrite = (char *)endPos - bufferPos;
break;
}
}
}
while (bytesToWrite > 0) {
qint64 bytesWritten = file.write(bufferPos, bytesToWrite);
if (bytesWritten == -1) {
qDebug() << "AudioFileWriter: error writing into the audio file:" << file.errorString();
file.close();
return;
}
bytesToWrite -= bytesWritten;
bufferPos += bytesWritten;
}
firstSampleNanos += MasterClock::NANOS_PER_SECOND * framesToRender / sampleRate;
frameCount -= framesToRender;
if (!realtimeMode) qDebug() << "AudioFileWriter: Rendering time:" << (double)firstSampleNanos / MasterClock::NANOS_PER_SECOND;
}
}
qDebug() << "AudioFileWriter: Rendering finished";
if (!realtimeMode) qDebug() << "AudioFileWriter: Elapsed seconds: " << 1e-9 * (MasterClock::getClockNanos() - startNanos);
if (waveMode) {
unsigned char *charBuffer = (unsigned char *)buffer;
memcpy(charBuffer, WAVE_HEADER, 44);
quint32 fileSize = (quint32)file.size();
qToLittleEndian(fileSize - 8, charBuffer + 4);
qToLittleEndian(fileSize - 44, charBuffer + 40);
qToLittleEndian(sampleRate, charBuffer + 24);
qToLittleEndian(sampleRate * FRAME_SIZE, charBuffer + 28);
file.seek(0);
file.write((char *)charBuffer, 44);
}
file.close();
synth->close();
if (!realtimeMode) {
Master::getInstance()->setAudioFileWriterSynth(NULL);
}
if (!stopProcessing) emit conversionFinished();
}
void AudioFileRenderer::run() {
AudioFileWriter writer(sampleRate, outFileName);
if (!writer.open(!realtimeMode)) {
synth->close();
if (!realtimeMode) Master::getInstance()->setAudioFileWriterSynth(NULL);
emit conversionFinished();
return;
}
MasterClockNanos startNanos = MasterClock::getClockNanos();
MasterClockNanos firstSampleNanos = 0;
MasterClockNanos midiTick = 0;
MasterClockNanos midiNanos = 0;
QMidiEventList midiEvents;
int midiEventIx = 0;
uint parserIx = 0;
if (realtimeMode) {
firstSampleNanos = startNanos;
} else {
midiEvents = parsers[parserIx].getMIDIEvents();
midiTick = parsers[parserIx].getMidiTick();
}
qDebug() << "AudioFileRenderer: Rendering started";
while (!stopProcessing) {
uint frameCount = 0;
if (realtimeMode) {
frameCount = uint((sampleRate * (MasterClock::getClockNanos() - firstSampleNanos)) / MasterClock::NANOS_PER_SECOND);
if (frameCount < bufferSize) {
usleep(ulong((MasterClock::MICROS_PER_SECOND * (bufferSize - frameCount)) / sampleRate));
continue;
} else {
frameCount = bufferSize;
}
} else {
while (midiEventIx < midiEvents.count()) {
const QMidiEvent &e = midiEvents.at(midiEventIx);
bool eventPushed = true;
MasterClockNanos nextEventNanos = midiNanos + e.getTimestamp() * midiTick;
quint32 nextEventFrames = quint32(((double)sampleRate * nextEventNanos) / MasterClock::NANOS_PER_SECOND);
frameCount = uint((sampleRate * (nextEventNanos - firstSampleNanos)) / MasterClock::NANOS_PER_SECOND);
if (bufferSize < frameCount) {
frameCount = bufferSize;
break;
}
switch (e.getType()) {
case SHORT_MESSAGE:
eventPushed = synth->playMIDIShortMessage(e.getShortMessage(), nextEventFrames);
break;
case SYSEX:
eventPushed = synth->playMIDISysex(e.getSysexData(), e.getSysexLen(), nextEventFrames);
break;
case SET_TEMPO:
midiTick = parsers[parserIx].getMidiTick(e.getShortMessage());
break;
default:
break;
}
if (!eventPushed) {
qDebug() << "AudioFileRenderer: MIDI buffer overflow, midiNanos:" << midiNanos;
break;
}
midiNanos = nextEventNanos;
midiEventIx++;
emit midiEventProcessed(midiEventIx, midiEvents.count());
}
if (midiEvents.count() <= midiEventIx) {
if (parserIx < parsersCount - 1) {
++parserIx;
midiEventIx = 0;
midiEvents = parsers[parserIx].getMIDIEvents();
midiTick = parsers[parserIx].getMidiTick();
continue;
}
if (!synth->isActive() && frameCount == 0) break;
frameCount += bufferSize;
qDebug() << "AudioFileRenderer: Rendering after the end of MIDI file, time:" << (double)midiNanos / MasterClock::NANOS_PER_SECOND;
}
}
while (frameCount > 0) {
uint framesToRender = qMin(bufferSize, frameCount);
synth->render(buffer, framesToRender);
if (!writer.write(buffer, framesToRender)) {
synth->close();
if (!realtimeMode) Master::getInstance()->setAudioFileWriterSynth(NULL);
emit conversionFinished();
return;
}
firstSampleNanos += MasterClock::NANOS_PER_SECOND * framesToRender / sampleRate;
frameCount -= framesToRender;
if (!realtimeMode) qDebug() << "AudioFileWriter: Rendering time:" << (double)firstSampleNanos / MasterClock::NANOS_PER_SECOND;
}
}
qDebug() << "AudioFileRenderer: Rendering finished";
if (!realtimeMode) qDebug() << "AudioFileRenderer: Elapsed seconds: " << 1e-9 * (MasterClock::getClockNanos() - startNanos);
writer.close();
synth->close();
if (!realtimeMode) Master::getInstance()->setAudioFileWriterSynth(NULL);
if (!stopProcessing) emit conversionFinished();
}
